The idiom "the good and the bad are intermingled" comes from the Notes of Yuewei Caotang written by Ji Xiaolan, a famous minister in Qing Dynasty. Volume 10. If I smell four ". The original text is: "For our generation, there are all kinds of ugliness, and for human beings, there are also good and bad." In addition, it is also mentioned in Li's Officialdom in the Qing Dynasty. Nowadays, people often use the idiom "mixed fish and dragons" to describe the mixture of good people and bad people.

According to the Ming Dynasty writer Heng's Notes on Liu Qing, the ancients regarded the different grades in the imperial examination as Lang, Guan and Xiu respectively. Among them, "Lang" is the lowest level and "Xiu" is the highest level. Therefore, in the Ming Dynasty, people used "no talent and no show" to refer to those high and low losers, and "good and bad are mixed" means "no talent and no show".

The "good" in "good and bad" refers to seedlings, and the "bad" in "good and bad" refers to evil grass, that is, green bristlegrass.

Setaria viridis, commonly known as Mao Mao Dog, is an annual weed in late spring, belonging to Gramineae and Gramineae, which is propagated by seeds. The leaves of Setaria viridis are flat, which looks a bit like rice seedlings, and they are often mixed in rice seedlings, so it is difficult to tell them apart. The root system of Setaria viridis is developed. If it is not pulled out in time, it will compete with seedlings for water, nutrients and light, which will interfere with crop growth.